Though Anderson looks better than ever, her former Baywatch costar Nicole Eggert -- who will complete in the next season of VH1's Celebrity Fit Club -- has packed on the pounds. Anderson told Us, "I haven't seen her in a long time."

So how does Anderson - mother to sons, Brandon, 12 and Dylan, 11 - stay in such great shape?

It's all natural," PETA Vice President (and pal) Dan Mathews told Us. "I mean, even if she's had to fly all night to meet with some government official with little sleep, she still has this upbeat attitude, and it's very much about determination with her. She's a great mother. Her kids are [older], ready to give her headaches, but she's great with them."